Yes, all circuits are protected by a fuse.
You start by figuring out what's wrong with them, then proceed from there.
Bad electrical connections.
TO ADD FREON TO A PETERBILT YOU MUST FIRST GET SOME TRAINING ON THE A/C SYSTEM.THEN YOU HOOK PU YOUR A/C GAUGES (134A) SET,BLUE TO THE LOW SIDE AND RED TO THE HIGH SIDE.NOW TURN ON THE TRUCK , MAKE SURE THE A/C IS ON THEN GO BACK TO YOUR GAUGES AND OPEN THE VALVES .BUT ONLY AT THE FITTINGS NOT ON THE MANIFOLD.NOW YOU SHOULD HAVE A READING ON YOUR GAUGES. A GOOD READING IS ABOUT 35 P.S.I ON THE LOW SIDE AND NOT TO EXCEED 300 P.S.I ON THE HIGH SIDE, DON'T OVER CHARGE IT OR DAMAGE CAN BE DONE TO THE A/C SYSTEM. ----
The coldness
Could be the sending unit or a problem with the wiring if electrical.
Mechanical drive for the speedometer only.
They are called gauges. Perhaps I don't understand the question. There is a fuel gauge, which tells you how much fuel you have, or an electrical gauge, or one that gauges speed. I guess depending on the gauge there is a different name. So your speed gauge is your speedometer. Your RPM gauge is the tachometer, and so on.
There is a electrical system controller (esc) that's where the cluster gets its info from for example battery voltage
"Mechanical Strain gauges" do not have inductance. There are many types of strain gauge: Mechanical, photoelastic, electrical etc.... Are you wanting the inductance of an electrical strain gauge? if so which type?
Probably electrical, you may have accidentally unplugged a connector.
Full diagnostics at: http://www.4x4wire.com/jeep/tech/electrical/gauges/
A 2002 Jeep Grand Cherokee engine that cranks but is not starting and has no dash gauges is experiencing an electrical system failure. This can be a result of a faulty ignition switch or damaged wiring.